Improvement in sewing-machines



' D. H. COLES.

Sewing-Machines. No.152,82 9. V Patentedluly 7,1874.

\Yihiesses: Invent or;

THE GRAPHIC CO. PHOTG'LIY 1' '39 8. 5 PARK "PLACEJLY.

UNITED STATES PATENT OFFICE.

DAVID H. CODES, OF NEW YORK, N. Y.

IMPROVEMENT IN SEWING-MACHINES.

Specification forming part of Letters Patent No. 152,829, dated July 7, 1874; application filed January 2, 1874.

To all whom it may concern:

Be it known that I, DAVID HAMILTON COLES, of the city, county, and State of New York, have invented a new and useful Iinprovement in Sewing-Machines; and I do hereby declare the following to be a full, clear, and exact description thereof, which will enab le those skilled in the art to make and use the same, reference being bad to the accompa-nying drawing forming part of this specification, in which drawing- Figure 1 represents a sectional side View of this invention. of the same.

Similar letters indicate corresponding parts.

This invention consists in the combination of one or more set-screws with a hinged clothplate, and with afriction-disk which is mounted on the driving-shaft of the sewing mechanism, and which bears upon the periphery of a flywheel mounted on the driving-shaft, so that, by means of said set screws, the friction between the friction-disk and the fly-wheel can be regulated.

In the drawing, the letter A designates the cloth-plate of my sewing-machine, which is connected to the table B by means of hingejoints (1, Fig. 2, so that the same can be turned up or down.' From the under surface of said cloth-plate project lugs b, which form the bearings for the main shaft 0, and on this main shaft is mounted a friction disk, 0, which,

Fig. 2 is a transverse section when the cloth-plate is turned down to the position shown in the drawing, bears upon the periphery of a fly-wheel, D, that receives a revolving motion by a treadle or other means. In the table B are secured one or more setscrews, d, on the side opposite to the hinge joints a, so that, by these set-screws, the cloth plate can be slightly raised, and the frictional contact between the disk 0 and the fly-wheel D can be regulated with the greatest nicety.

This adjustment of the frictional contact be tween the fly-wheel and friction disk is very desirable; for if the frictional contact is too hard the table B is liable to jump, and the motion of the sewing mechanism becomes unsteady; and, if the frictional contact is not hard enough, the sewing mechanism is liable to stop.

I disclaim everything shown and described in Patent No. 134,463.

What I claim as new, and desire to secure by Letters Patent, is-

A sewing-machine having the shaft 0 and friction-disk 0, when hinged to the sewinglnacliine table, and combined with the adjust able screw d and fly-wheel D, to raise and lower the sewing-machine bed, as and for the purpose set forth.

DAVID H. OOLES. W'itnesses:

W. HAUFF, JAMES L. Nonnrs. 

